Hi @gw12505 .
The pattern of muscle activations you’re using for fretting is problematic.
You’re “lifting” your 1st finger by extending at the middle (PIP) joint, which implies activation of your lumbrical muscle. To fret, you’re then required to engage a muscle called flexor digitorum superficialis (FDS). This only allows for very limited activation of individual fingers, engaging it the way you’re doing is creating problems for your middle finger.
Coupled with this, your 2nd finger moves into an extreme position of hyperextension of the big (MCP) joint, with flexion at the small (DIP) joint. This implies a cocontraction between extensor digitorum communis (EDC) and flexor digitorum profundus (FDP). These are communal muscles which act on all fingers.
Then, due to the overactivity of EDC and FDP, you must forcefully extend your 3rd and 4th fingers, whatever way you still can. So, your extensor digiti minimi (EDM) which extends these fingers is activated, and you fret primarily through the activation of the interossei muscles and the hypothenar muscles.
This isn’t it at all. Playing guitar fast is as easy as wiggling your fingers.
This will not work without changing the actual pattern of muscular activation. He needs to retrain his movement patterns.
There’s two ways to make a movement smaller. You can either do it faster (higher frequency), or you can increase cocontractions. If the movement is smaller and you’re not playing faster, you’ve increased cocontraction, which is absolutely not what we want to do.
Small doesn’t make fast, and small doesn’t make easy. Easy enables fast and fast makes small. We need to start with easy.
You learn to apply the resting position of your hand to the guitar to achieve fretting postures which align your natural grip mechanics to fretting tasks. Nothing is easier than resting.
If your position of rest has the fingers in contact with the strings, then you don’t need to work to keep them close, and your movements will remain effective as they inevitably get smaller when playing faster.